Hakone Kowakien Yunessun, which celebrated its 25th anniversary on January 1st, 2026, announces a special event commemorating the theatrical release of Doraemon the Movie: New Nobita and the Castle of the Undersea Devil (opening February 27th, 2026). Doraemon the Movie: New Nobita and the Castle of the Undersea Devil - Hot Spring Marine Park in Yunessun Resort will run from March 7th (Saturday) through May 25th (Monday), 2026.
This event celebrates both Yunessun's 25th anniversary and the 45th film in the Doraemon movie series, featuring special content across two facilities: the water theme park Yunessun and the glamping resort Fuji no Kirameki Fuji Gotemba.
At Yunessun, the water theme park, decorations throughout the facility bring the ocean-themed movie world to life. A collaborative bath in the indoor area features the "Beachside Bath," inspired by Doraemon and friends departing on their adventure from the beach. Beyond the "Anywhere Door" in the outdoor area, visitors can enjoy the "Ocean View Sauna" where Doraemon and friends can be seen playing in the sea, and the "Undersea Cave Bath" inspired by the underwater world the characters explore in the film. Poolside, guests can enjoy the special drink "Marine Blue Soda." Visitors who present either a movie ticket stub, digital ticket barcode, or ticket purchase history for Doraemon the Movie: New Nobita and the Castle of the Undersea Devil receive discounted admission (with limited original goods).
At the glamping resort Fuji no Kirameki Fuji Gotemba, Doraemon welcomes guests with Mt. Fuji as a backdrop. Guests who book a Yunessun package through the official website receive an original sticker as a bonus.
This spring, enjoy a memorable time with Doraemon, a character beloved across generations, at Yunessun.
Special website: https://www.yunessun.com/doraeiga2026
Doraemon the Movie: New Nobita and the Castle of the Undersea Devil Commemorative Event Overview
Event Name: Doraemon the Movie: New Nobita and the Castle of the Undersea Devil - Hot Spring Marine Park in Yunessun Resort
Event Period: March 7th (Saturday), 2026 to May 25th (Monday), 2026
Content: Collaborative baths, collaborative sauna, special drinks, campaigns, etc.
※Content may change or be cancelled without notice. Please understand in advance.
Collaborative Bath
"Beachside Bath"
A bath inspired by Doraemon and friends departing on their adventure from the beach!
Location: Yunessun water theme park, Indoor Area "Green Terrace"
Period: March 7th (Saturday), 2026 to May 25th (Monday), 2026
Operating Hours: Weekdays 10:00 AM to 6:00 PM, Weekends and Holidays 9:00 AM to 7:00 PM
Scent: Ramune scent
※Yunessun (swimsuit area) admission fee required. Adults (junior high school students and above) from ¥2,500 (tax included), Children (age 3 and up) from ¥1,400 (tax included)
※Images are for reference only.
"Undersea Cave Bath"
Like the bottom of the ocean floor! A bath inspired by the underwater world where Doraemon and friends adventure in the film!
Location: Yunessun water theme park, Outdoor Area "Rock Cave ONSEN"
Period: March 7th (Saturday), 2026 to May 25th (Monday), 2026
Operating Hours: Weekdays 10:00 AM to 6:00 PM, Weekends and Holidays 9:00 AM to 7:00 PM
Scent: Ocean scent
※Yunessun (swimsuit area) admission fee required. Adults (junior high school students and above) from ¥2,500 (tax included), Children (age 3 and up) from ¥1,400 (tax included)
※Images are for reference only.
Collaborative Sauna
"Ocean View Sauna"
A sauna where you can see Doraemon and friends playing in the ocean!
Location: Yunessun water theme park, Outdoor Area "Finland Bath"
Period: March 7th (Saturday), 2026 to May 25th (Monday), 2026
Operating Hours: Weekdays 10:00 AM to 6:00 PM, Weekends and Holidays 9:00 AM to 7:00 PM
Event: Löyly and Aufguss sessions (approximately 5-10 minutes)
Event Times: Twice daily (①11:30 AM, ②2:30 PM)
Scent: Refreshing ocean-inspired scent
※Yunessun (swimsuit area) admission fee required. Adults (junior high school students and above) from ¥2,500 (tax included), Children (age 3 and up) from ¥1,400 (tax included)
※Images are for reference only.
※During event sessions, the sauna room may be crowded. We ask guests to share the space courteously.
Special Drink
Original drink inspired by the deep sea!
Product Name: Marine Blue Soda
Sales Location: Yunessun water theme park, Indoor Area "Fontana"
Sales Period: March 7th (Saturday), 2026 to May 25th (Monday), 2026
Operating Hours: Weekdays 10:30 AM to 5:30 PM (Last Order 5:00 PM), Weekends and Holidays 10:00 AM to 5:30 PM (Last Order 5:00 PM)
※Yunessun (swimsuit area) admission fee required. Adults (junior high school students and above) from ¥2,500, Children (age 3 and up) from ¥1,400 (tax included)
※Content may change without notice. Items may sell out or be discontinued.
Campaign
Doraemon the Movie: New Nobita and the Castle of the Undersea Devil Movie Ticket Stub Campaign
Present your movie ticket stub, digital barcode ticket screen, or ticket purchase screen for Doraemon the Movie: New Nobita and the Castle of the Undersea Devil at the front desk to receive up to ¥500 off swimsuit area admission! Plus, the first 1,000 guests receive an original mini towel!
Discount Details: Adults (junior high school students and above) Regular price from ¥2,500 → Special price from ¥2,000 (tax included)
Children (age 3 and up) Regular price from ¥1,400 → Special price from ¥1,000 (tax included)
Period: March 7th (Saturday), 2026 to May 25th (Monday), 2026
How to Use: At Yunessun 4th floor general front desk during check-in, show staff your Doraemon the Movie: New Nobita and the Castle of the Undersea Devil movie ticket stub, digital barcode ticket screen, or purchase screen.
Bonus: Doraemon the Movie: New Nobita and the Castle of the Undersea Devil Original Mini Towel (Yunessun version)
※Images are for reference only.
※One stub discounts up to 5 guests.
※Cannot be combined with other coupons or discounts.
※One original mini towel per stub.
※Yunessun uses dynamic pricing, with admission fees varying by visit date. Please check the official website for details.
Fuji no Kirameki Fuji Gotemba
At the glamping resort Fuji no Kirameki Fuji Gotemba, where every room offers Mt. Fuji views, a photo spot with Doraemon appears during the event period! Take commemorative photos with Mt. Fuji as your backdrop. Additionally, all guests who book a Yunessun package through the official website receive an original sticker!
Period: March 7th (Saturday), 2026 to May 25th (Monday), 2026
Eligibility: All guests who book a Yunessun package at Fuji no Kirameki Fuji Gotemba through the official website
Bonus: Doraemon the Movie: New Nobita and the Castle of the Undersea Devil Original Sticker (Fuji no Kirameki version)
Reservation Website: https://go-fujita-kanko.reservation.jp/ja/hotels/fkg031/plans/10184770
※Images are for reference only.
Opening February 27th (Friday)! Doraemon the Movie: New Nobita and the Castle of the Undersea Devil
Story
When the gang can't agree on where to go camping during summer vacation, Doraemon suggests camping in the middle of the ocean! Using the secret gadgets "Underwater Buggy" and "Adaptation Light," the five enjoy underwater camping while meeting various sea creatures. After discovering a sunken ship, they encounter a mysterious young man named El. He turns out to be an "undersea person" living in the Mu Federation beneath the ocean! The undersea people distrust land-dwellers and can't trust Nobita and friends. Then comes the announcement: "Onigashima Castle... has begun its activity!!" What is this "Onigashima Castle" that the undersea people fear? With faith in friendship in their hearts, embark on this grand adventure with Earth's fate hanging in the balance!
Official Website: https://doraeiga.com/2026/
©Fujiko-Pro, Shogakukan, TV-Asahi, Shin-ei, and ADK 2026
About Hakone Kowakien Yunessan
Hakone Kowakien Yunessan opened in 2001 as an all-weather hot spring theme park. After undergoing the largest-scale renovation since opening in 2023, it celebrated its 25th anniversary on January 1st, 2026. By maximizing the use of abundant hot springs from its own source and unused land, the facility expands as a comprehensive experience resort offering various content. As a must-visit destination in Hakone, Yunessun aims to energize the entire Hakone Kowakien area and contribute to revitalizing the Hakone region.
Official Website: https://www.yunessun.com/
